73 lines
2.9 KiB
Python
73 lines
2.9 KiB
Python
from typing import Set # noqa
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from django.apps import apps
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from django.contrib.contenttypes.models import ContentType
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from ..utils.auth import has_perm
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from ..utils.autoupdate import inform_changed_data
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from ..utils.collection import Collection
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from .models import Item
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def listen_to_related_object_post_save(sender, instance, created, **kwargs):
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"""
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Receiver function to create agenda items. It is connected to the signal
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django.db.models.signals.post_save during app loading.
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Do not run caching and autoupdate if the instance as an attribute
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skip_autoupdate (regardless of its truthy or falsy conent).
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"""
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if hasattr(instance, 'get_agenda_title'):
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if created:
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# If the object is created, the related_object has to be sent again.
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Item.objects.create(content_object=instance)
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if not hasattr(instance, 'skip_autoupdate'):
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inform_changed_data(instance)
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elif not hasattr(instance, 'skip_autoupdate'):
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# If the object has changed, then also the agenda item has to be sent.
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inform_changed_data(instance.agenda_item)
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def listen_to_related_object_post_delete(sender, instance, **kwargs):
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"""
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Receiver function to delete agenda items. It is connected to the signal
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django.db.models.signals.post_delete during app loading.
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"""
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if hasattr(instance, 'get_agenda_title'):
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content_type = ContentType.objects.get_for_model(instance)
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try:
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# Attention: This delete() call is also necessary to remove
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# respective active list of speakers projector elements.
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Item.objects.get(object_id=instance.pk, content_type=content_type).delete()
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except Item.DoesNotExist:
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# Item does not exist so we do not have to delete it.
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pass
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def get_permission_change_data(sender, permissions, **kwargs):
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"""
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Yields all necessary collections if 'agenda.can_see' or
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'agenda.can_see_hidden_items' permissions changes.
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"""
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agenda_app = apps.get_app_config(app_label='agenda')
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for permission in permissions:
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# There could be only one 'agenda.can_see' and then we want to return data.
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if (permission.content_type.app_label == agenda_app.label
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and permission.codename in ('can_see', 'can_see_hidden_items')):
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yield from agenda_app.get_startup_elements()
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break
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def required_users(sender, request_user, **kwargs):
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"""
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Returns all user ids that are displayed as speakers in any agenda item
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if request_user can see the agenda. This function may return an empty
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set.
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"""
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speakers = set() # type: Set[int]
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if has_perm(request_user, 'agenda.can_see'):
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for item_collection_element in Collection(Item.get_collection_string()).element_generator():
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full_data = item_collection_element.get_full_data()
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speakers.update(speaker['user_id'] for speaker in full_data['speakers'])
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return speakers
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